Answer this question truthfully
### Question: What are the symptoms of persistent left superior vena cava?
### Response: The signs and symptoms depends on where the left superior vena cava flows to. If it finally flows to right atria, patients may have no sign or aymptom. But if the left superior vena cava flows to flows to left atria, symptoms may include anoxemia, such as fatigue, weakness, dizziness and shortness of breath.